6EST

INTERACTION OF THE PEPTIDE CF3-LEU-ALA-NH-C6H4-CF3(TFLA) WITH PORCINE PANCREATIC ELASTASE. X-RAY STUDIES AT 1.8 ANGSTROMS

Summary for 6EST

• Entry DOI: 10.2210/pdb6est/pdb
• Descriptor: PORCINE PANCREATIC ELASTASE, CALCIUM ION, SULFATE ION, ... (5 entities in total)
• Functional Keywords: hydrolase(serine proteinase)
• Biological source: Sus scrofa (pig)
• Cellular location: Secreted: P00772
• Total number of polymer chains: 1
• Total formula weight: 26283.45

Authors

Prange, T.,Li De Lasierra, I. (deposition date: 1990-06-15, release date: 1991-10-15, Last modification date: 2024-10-30)

Primary citation

de la Sierra, I.L.,Papamichael, E.,Sakarellos, C.,Dimicoli, J.L.,Prange, T.
Interaction of the peptide CF3-Leu-Ala-NH-C6H4-CF3 (TFLA) with porcine pancreatic elastase. X-ray studies at 1.8 A.
J.Mol.Recog., 3:36-44, 1990

PubMed Abstract: The peptide trifluoroacetyl-Leu-Ala-(p-trifluoromethylanilide), is a reversible inhibitor of pancreatic porcine elastase and is characterized by a Km of 2.5 x 10(-8) M. Co-crystals of the 1:1 complex were obtained in an acetate buffer + dimethylformamide solution at pH 5.7. Diffraction data were recorded on films at the LURE synchrotron facility. The inhibitor was localized on difference Fourier maps, and the refinement of the structure was performed by simulated annealing (XPLOR). The current agreement factor is R = 19% (for 13224 observed structure factors and 1.8 A effective resolution). The RMS deviations from ideality of bond distances and angles are 0.02 A and 2 degrees, respectively. The inhibitor molecule was found in the active site, bent around the side chain of Phe-215 in a geometry that resembles the previously reported structure of the CF3-Lys-Ala complex at 2.5 A, in a parallel beta-sheet association with the loop 214-216. The analysis of the close contacts (less than 3.5 A) indicates that the trifluoromethylamide bond interacts with the active site and not the Leu-Ala or Ala-anilide bonds. The two fluorinated groups of the inhibitor exhibit different specificities: the trifluoroacetyl group (N terminus) is tightly stacked between the two chain loops 191-195 and 213-215, while the trifluoromethylanilide (C terminus) shows less specificity and only a single contact.

PubMed: 2354062
DOI: 10.1002/jmr.300030104

Experimental method

X-RAY DIFFRACTION (1.8 Å)